Liquidproof paper container



Feb. 4, 1947. c. BROOKS LIQUIDPROOF PAPER CONTAINER Filed Oct. 25. 1942 3 Sheets-Shet 1 v a m, Lswzs C. Breaks Feb. 4, 1947.

L. C. BROOKS LIQUIDPHOOF PAPER CONTAINER Filed Oct. 23. 1942 3 Sheets-Sheet 2 LEWIS C. Bmuks v Feb, 4, 1947. c. BROOKS 2,415,081 mqumrnoor' PAPER con'mmm Filed Oct. 23, 1942 3 Sheets-Sheet 3 LEWIS Cfiruaks Patented at. 4. 1947 ear a LIQUIDPROOF PAPER CONTAINER Lewis- C. Brooks, Madison, Wis., assignor of onethlrd to Ira Milton Jones, Mequon, Wis.

Application October 23, 1942, Serial No. 463.109

'1 Claims. 1

This invention relates to paper containers and refers particularly to paper containers designed for public dispensing of milk and other liquid food products.

' Paper milk containers have been used in the past. Some of them have flat top and bottom walls, which is desirable from the standpoint of facilitating handling and particularly the stacking of the filled containers; but many of the paper containers heretofore in use for milk dis tribution do not have flat top walls.

In all of the paper containers heretofore in use for this purpose dilliculty has been'experienced in providing'a. convenient pouring openmg. This disadvantage is particularly prevalent in that type of container in which the top is not flat as inthe bag type containers like that illustrated in the patent to Scott No. 2,006,689.

In paper containers of the type represented byv the patent to Hothersall No. 2,085,979, in

which the top wall is flat, special provision is made for a pouring opening, but the construction of these containers is such that the opening is located wholly within the confines of the top which results in an objectionable ledge across which the contents must-be poured.

Moreover, that type of container illustrated in the Hothersall patent has its top and bottom walls formed separately from the side walls and secured thereto in the formation of the container. As a result, this type of container cannot be shipped flat for erection at the point of use as are containers of the one-piece blanlr containers, the present invention has as one of its objects the provision of a paper container suitable for public dlstrlbutiofi of milk and other liquid products which, although of the single blank type like the container of the Scott Patent accuses, has flat top and bottom walls and iacillty for convenient pouring of its contents.

More specifically, it is an object of this inven tion to provide a. liquid tight paper container having a list top wall with a corner portion thereof formed as a hinged flap adapted to be lifted to an open position to provide a ,pour= ing opening at the extreme comer of the con tainer.

Another object of this invention is to provide a novel manner of sealing the cover opening under the hinged cover flap so that the flap need not be secured down tight, but can be h eld closed by a readily broken seal.

Another object of; this invention is to provide reinforced roundedcorners tor the topmar ginal edges of the side walls of the container which define the pouring opening.

A further object of this invention is to provide a container having these desirable characteristics which is formed entirely from a single'blank and which when erected and coated with paraflln or other similar Waterproofing substance is exceptionally strong and rigid.

Still another object of this invention is to provide a one piece container of the character described which is so constructed that both top and bottom closures are readily formed over internal supports.

In this connection it is an object of this invention to so construct the container that a relatively large opening is provided through which expansible internal supporting tools may be inserted and which by its large size facilitates parafllning of the container.

With the above and other objects in view, whichwlll appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it be- .ing understood that suchchanges inthe precise embodiment of the hereindisclosed invention may be made as come within the scope oi the claims. r

.The accompanying drawings illmtrate two complete examples of the physical embodiment of the invention constructed according to the best mode so far devised for the practical ap l plication of theprlnciples thereof, and in. which:

Figure 1 is a perspective view of a container embodying this invention and illustrating the same opened for emptying its contents;

Figure 2 is a perspective view of the upper portion of the container with parts broken away to more clearly illustrate the cover construction;

Figure 3 is a plan view of the blank in its flat form.

Figure 4 is a plan view of a slightly modified blank;

Figure 5 is a perspective view illustrating the 'contalner which the blank of Figure 4 forms, partially set up;

Figure 6 is a perspectiv view of the completed container showing the manner in which final 45 scaling is eflected; i

Figure '7 is a fragmentary perspective view of the sealed container to show the use of a temporary seal to hold the closure flap in its closed position; i

to Figure 8 is afragmentary perspective view like Figure '1 showing another manner of holding the closure flap down; and

Figure 9 is a fragmentary perspective view of the upper portion of a container illustrating a so slightly modified construction for the pouring opening.

Referring now particularly to the accompanying drawings, in which like numerals indicate like parts, it will be seen that the blank B comco prises four vertical side panels 5, 6, i and 8 defined from each other by score lines 9, l0 and I l.

A glue lap i2 extends along the free edge of side panel 5 being defined therefrom by a score line l3. In forming the container this glue lap is adhered to the free edge of the side wall 8, as is customary.

Extending across the bottom of the blank is a score line [4 which defines three marginal flanges or laps i5, i6 and I! on the lower marginal edge portions of the side walls 6, i and 8, respectively. The side wall 5 has a bottom forming extension l8 defined therefrom by the score line It and this bottom forming extension has marginal flanges or laps l9 adapted to be folded up and adhered to the outer suri'aces of the side walls when the container is set up or erected for use.

The flanges I5, l6 and I1 turn in and are adhered to the bottom forming extension is when the container is made up.

The top of the blank has a transverse score line 20 extending thereacross which, on the side walls 6 and 8 defines marginal flanges or laps 2i and 22, the latter being divided by a slit 23 into two sections. The inner section of the flange or lap 22 is adapted to be turned in as indicated by the lines 22' in Figure 3 to provide a reinforced rounded edge for the top of the side wall 8. v

A similar reinforced rounded edge is formed on the adjacent part of the side wall 1 bya marginal flange or lap 24 on this side wall I and divided by the score line 20. The flange 24, like flange-22, is adapted to be folded in as indicated by the dotted lines 24'.

For its remaining width, the side wall 'I has an extension 25 defined therefrom by the score line 20. This extension 25 is long enough to extend ironithe side wall I to the side wall 5 when the container is made up, but, being narrower than the side wall 1, does not cover the entire top of the container.

The actual and final closure for the top of the container is effected by a top wall forming section 26 hinged to theside wall 5. This section 26 is large enough to cover the entire top of the container and when the container is set up for use covers and is adhered to the extension 25.

A slit 21 extending into the section 28 for a substantial distance provides for a movable flap portion 28 which closes the opening left by the insufficient width of the extension 25. It is to be noted, however, that the cover flap 28 is wider than this opening so that its inner edge portion overlies the extension 25 to be adhered thereto when the container is closed and sealed.

The movable cover flap is defined jointly by the slit 21 and a score line 29 on which the flap may hinge and swing to and from its closed position.

Along the three free marginal edges of the cover section 26 are flanges or laps 88, 3| and 32 adapted to fold over and be adhered to the outer surfaces of the side walls to secure the cover closed.

With'the entire movable cover flap 28 swung open about the score line hinge 28, a comparatively large opening is provided to facilitate filling the container. For pouring out its contents the opening need not be so large, and preferably is smaller. Consequently, the movable cover flap 28 is divided by a score line 33 and a slit 34 extending across its flange 32, into an inner and outer section.

The outer section provides a hinged flap 35 which is opened to form a pouring opening at the corner of the container defined by the juncture of the walls-l and 8. These walls as noted hereinbefore, have their upper edges rounded and reinforced by the inturned flanges 22 and 24.

Being relatively small, the hinged flap 35, reinforced by its side flanges 3| and 32, may be readily opened and closed after the seal is once broken.

-' The hinged fiap as thus not only affords a convenient manner of opening the container to enable pouring the contents therefrom, but also serves as a closure or stopper to protect the contents after the container has been opened and partially emptied.

Attention is also directed to the fact that the top of the container, for much of its area, is of double thickness formed by the section 26 being superimposed on and adhered to the extension and the flanges or laps on the side walls.

As is customary in paper containers of this type, liquid proofing is effected by coating all surfaces of the container with parafiln or other suitable waterproof substance prior to the filling of the container, and, as will be readily apparent to those skilled in the art, when so coated, the container wil1 be exceptionally rigid and strong and by virtue of the location of its pouring opening will be easily emptied.

As will be apparent to those skilled in this art, I

the paraflining of the container interior is materially facilitated by the large filling opening;

This large opening also enables the insertion of an expansible tool into the container to provide an internal support for the, formation of the bottom closure; the formation of the top 010- sure having been previously effected over a suitable internal support inserted through the open bottom of the body.

If desired the flnal sealing of the container (after filling) may be eflected by merely adhering the hinged cover flap 28 including its outer smaller hinged portion 35 to the P ojecting portion of the extension 25 and by adhering its flanges 3i and 32 to the side walls of the body. While this forms an effective seal, it may be a bit diflicult for the consumer to. pry the hinged flap 35 open. The manner of sealing the filled container illustrated in Figure 5 is, therefore, more desirable.

However, before describing the sealing method shown in Figure 5, it is desired to direct attention to the specific construction of the container illustrated in Figures 4, 5 and 6. Generally, this container is like the one shown in Figure 1. The specific construction of the top and bottom closures, is, however, different. As a result of" this difference, a triple thickness top and bottom is obtained.

To produce the triple thickness bottom the blank BB (Figure 4) is so formed that the side wall I has a full sized extension. 36 which folds over half sized extensions 3'! and 38 on'the side walls 6 and 8, respectively, to provide two thicknesses inside the extreme bottom extension 39 on the .side wall 8. This latter extension 39 has flanges III which fold over and are adhered to the sides of the body.

One of these flanges, the one adjacent to the half sized extension 31, is notched as at 4|. While this reduces the width of the flange In at the back corner, it provides stock for increasing the length of the extension 31 and thereby provides a generally better construction.

In the formation of the top closure, the side walls I and 8 have flanges 42 and 43 folded over 5 and glued down as shown in F1, e 4, to provide the reinforced rounded pouring edge. Freierably the flanges l2 and 43 are one continuous lstrip so as to continue uninterruptedly around the corner formed at the score line H.

a The top edge the side wall 8 outwardly of the-flange 43 has a narrow extension 48 which is long enough to reach across the top to the side wall and thus cover the opening left be tween the edges of an extension 45 (on the side wall 6) and the adjacent side wall ii.

The top edge oi the side wall I not taken up with the flange 42 has an L shaped extension at thereon. This extension is long enough to reach to the side wall and is of the samewidth as the extension 45 which is somewhat greater than hell the width of the container, the remain-Y ing distance defining the width or the oper us. At its outer end the extension 45 is equal in width to the side wall 5 for adlstance out from the side wall 5 far enough to cover the narrow extension lid.

Thus, when the extensions and 4d are folded down and the extension 48 is folded thereover, a-

double thickness is obtained for the partially formed top, leaving a rectangular filling opening as long as the flange 63 and as wide as the flange i2. 7

The third thickness for the top closure is provided by an extension 41 on the side wall 5. This extension ll, like the bottom extension id, is

large enough to. cover the entire area of the top and, like the extension 38, it has flanges to to fold over and be adhered to the side walls. A notched or stepped out 49 in the extension to and the adjacent flange 48 is used to obtain maximum strength at the back corner the same as at the bottom.

The top extension 41, as in the previously tiescribecl construction, is divided into themed por-, tion it which is secured down in place when the container is set up for use, and a hinged cover bl left free until after the container has been parafiined and filled. As before, the filling opening is large enough to allow an expansible internal supporting tool to be inserted for supporting the bottom during its formation.

After the container is filled, final scaling is effected in the manner shown in Figure 6. As here shown, a piece of suitable sealing material it is applied over the filling opening. Ii waxed glassinc or other thin waxed paper is used no special adhesive is required as the War. coating fuses under heat and pressure. Obviously, other suitable sheet material like Pllofilm or Cellophane can be used for the seal.

If desired, an arrangementmay be used whereby the sealing material is cut from a ribbon red the edges oi. the opening and permanently adhere the rear section of the cover and its flange while the front section It is left free. This may be accomplished by coating the under surfaces or the rear section it and its flange with anadhesive while the iront section is left uncoated, or by protecting the under surfaces of the front secthe sealing material.

broken by the consumer to expose the thin sealing sheet. Puncturing. the sealing sheet allows the contents to be poured from the container, and as will be clear, after puncturing the sealing sheet the opening thus formed may be covered by a the hinged cover section or flap it which can be across the path 01. the containers as they leave the filling machine.

With a piece of the sealing material 56' covering the filling opening, the hinged coverbl is brought down and secured in place. "This cover, however, is divided transversely by a score line 52 into a rear section 53 and a front section M. A slit through the flange 48in line with the scoring 52 leaves the front section hingedly movable with respect to the rear section.

In applying the cover over the sealing sheet, the sheet is adhered all around the edges of the opening, as the hinge of the cover El is spaced rearwardly of the rear edge of the opening and the side of the cover overhangs the side of the opening. Any suitable means is employed-to simultaneously adhere the sealing sheet all around closed and opened at will.

Another manner or detachably securing the hinged front section or flap 54 down is illustrated in Figure 8. In this case one oi the side flanges 48 has a tab to extended therefromand adhered at its outer end to the side wall. Aline of per-- forations 5i dividing the tab from the flange 58 is substantially in line with the lower edge or the portion oi the flange do under it. 'The periorated tab portion is thus spaced a slight distance from the side wall to facilitate breakage along the perforations.

In the several embodiments of the invention Figure 9. As here shown a flat topped marginal edge extends around the entire perimeter of the pouring opening. The flat topped marginal rior-v tions 60 at the outer pouring corner oi the opening are formed by folding. extensions oi the flanges 22 and M in the manner specifically shown and described in the copending application or Lewis'C. Brooks, Serial No. 463,099 filed Qcto= ber 23, 1942.

. This provides a ilat top suriace be adhered. Obviously the specific formation or the shoulders to, l. e., their cross sectional shape forms no part of this invention and may be of any design desired, but preferably the flanges be are held to a narrow width to minimize the interierence with pouring.

What I claim as my invention is:

i; In a, paper container or the character described: flat vertical side walls, the upper edges or all of which lie in substantially a common horizontal plane; a flat top wall closing the top of the container, said flat top wall having a corner portion thereof hinged one score line so as to be movable to an open position providing a pour-- ing opening at said corner of the container; and marginal flanges on the top edges of the side walls forming said corner folded and adhered to having a fiat sided body comprising: naps hinged.

to the edges of the body sides folded over and adhered to each other to form a multiple thickness wall closing all but one side and corner porall around the pouring opening to which the sealing sheet may aerator ing said opening; and a sealing sheet of thin flexible material-impervious to the contents for which the container is designed adhered to the edges of the opening under said hinged flap.

3. An end closure for a flat sided fiber container comprising; flaps folded in from certain of the side walls to partially close the container end and leave a relatively large sized filling and 4 7 tool inserting opening through which accessis' had to the entire bottom of the container and through which the entire contents of the container may be quickly dispensed; an outer flap folded in from another side wall tooverlie the other flaps, said outer flap being of a size to cover the entire end. of the container and being out and scored to divide the same into a fixed part and a hinged part, the fixed part being adhered to the flap surfaces under it and the hinged part being over said filling openingv and being larger than the opening so that the flap portions to which'the fixed part is adhered provide inset ledges under the hinged part; and a frangible seal adhered to said ledges and closing the pouring opening under the hinged part;

4. An end'closure for a flat sided fiber container comprising: flaps folded in from certain of the side walls of the container to partially close the container end and leave a'relatively large sized filling opening through which the entire contents of the container maybe quickly dispensed, said filling opening enabling insertion of a bottom forming .tool into the container,'two sides of said pouring opening being defined by two side wallsof the container; an outer flap folded in from another side wall of the container to overlie the other flaps, said outer fla being of a size to cover the entire end of the container and being out and scored to divide the same into a fixed part and a hinged part, the fixed part being'adhered to the flap surfaces under it and the hinged part being over the pouring opening and being of a size to cover the entire pouring fined by the first designated flaps so that the flap portions to which th fixed part is adhered at said edges of the opening provide inset ledges under the hinged part; and a frangible seal adhered to said ledges and to the adjacent side walls of the container'to close the pouring opening under the hinged part.

5. In an end closure for flat sided fiber containersz' an outermost flap folded in from one side wall of the 'containerand covering the entire end of the container body, said outermost flap being scored and cut to divide the same into a fixed part and a hinged part; flanges on the fixed part permanently adhered to the adjacent side walls; flanges on the hinged part to overlie the adjacent side walls; a tab extended from one of the flanges on the hinged part having its outer end portion adhered to the adjacent side wall to hold the hinged part down, saidtab having a row of perforations across it; and means for spacing the flange carrying the tab from the adjacent side wall adjacent to said row of perforations to facilitate breaking the perforated por- 6. A paper container comprising: a body hav- 4 opening and extend beyond the edges thereof defile of this patent: V

UNITED STATES. PATENTS Number Name Date 1,698,699 Andrews Jan. 8, 1929 2,128,893 Bergstein Sept-6, 1938 2,272,203 Hothersall Feb. 10,1942 1,223,232 Ash Apr. 17, 1917 1,863,260 Van Buren June 14, 1932 1,863,261 Van Buren June 14, 1932 2,156,366 Volk May 2, 1939 1,909,649 Bayless May 16, 1933 1,967,687 Rice July 24, 1934 1,618,989; McCumpsey Mar. 1, 1927 1,918,088 Dunne July 11, 1933 2,249,052 Seiifert -,luly 15, 1941 ing flat side walls; fiat top and bottom closures for the ends of the body, the top closure having a filling and pouring opening through which the entire contents may be quickly dispensed and I through which an expansible supporting tool may be inserted into the container after the top closure has been formed to provide a support over which the bottom closure may be formed; said swung up on a hinge formed by one of the scored lines to provide a large filling opening through which the expansible supporting tool is insertable; and said hinged portion being divided by another scor line into inner and outer sections hingedly movable with respect to each other, the latter section providing a dispensing lid; and overlappin parts on said hinged portion and the adjacent under-flaps adapted to be adhered after filling of the container.

7. A paper container of the character described comprising: vertical side walls all having their upper edges lying in substantially a common horizontal plane; a flap hinged to one of said side walls and extending across the top of the container, said flap being substantially half the width of the container so as to leave the remaining half of the top thereof open; and a cover form ing section hinged to another side wall and overlying said flap and adhered thereto, said cover forming section covering the entire top of the container and having a corner portion thereof which overlies the part of the top not closed by said fiap out and hinged to be mo able to and from a closed position, said hinged corner portion having a transverse score dividing it into inner and outer sections the latter of which covers the extreme corner so that upon being lifted a pouring opening results, said hinged corner portion being wider than the opening left by the first designated flap so that said first designated flap provides a, ledge to which the hinged corner portion is adhered in sealing the container and portion to support the same.

LEWIS C. BROOKS.

REFERENCES crrEn- The following references are of record in the 

